Dimethyl Sulfoxide → HCID 11833079, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of oxalyl chloride (0.036 ml, 0.42 mmole) in dry CH2 Cl2 (0.5 ml) there was added dropwise a solution of dry DMSO (0.049 ml, 0.69 mmole) in dry CH2Cl2 (0.1 ml) at -78° C. over 5 min. After stirring for 10 min at -78° C., a solution of (2S,3R,4S,5S)-[3-(tert-butyldimethylsilyloxy)-4-methoxy-5-methyltetrahydro-2H-pyran-2-yl]methanol (0.1 g, 0.345 mmole) in dry CH2Cl2 (0.1 ml) was added dropwise to the resulting milky suspension over 5 min at -78° C. After stirring for 15 min at -78° C., triethylamine (0.24 ml, 1.73 mmole) was added dropwise to the reaction mixture over 3 min, and stirring was continued for 30 min at -78° C. The reaction mixture was then warmed up to room temperature gradually and partitioned between CH2Cl2 (10 ml) and water (10 ml). The methylene chloride layer was washed with brine (5 ml×2), dried over anhydrous sodium sulfate and evaporated to dryness under reduced pressure. The residue was chromatographed on silica gel using AcOEt/n-hexane (1:9) as an eluent to give (2R,3R,4S,5S)-3-(tert-butyldimethylsilyloxy)-4-methoxy-5-methyltetrahydro-2H-pyran-2-carbaldehyde (0.085 g, 86% yield) as a colorless oil; EI-MS: m/z 288 (M+); 1H-NMR (CDCl3)d: 0.85 (3H,d,J=7 Hz), 0.87 (9H,s), 2.28 (1H,m), 3.12 (1H,dd,J=4 & 5 Hz), 3.28 (3H,s), 3.59 (1H,dd,J=5 & 11.5 Hz), 3.81 (1H,d,J=4. Hz), 3.81 (1H,dd,J=9 & 11.5 Hz), 4.08 (1H,dd,J=4 & 5 Hz), 9.80 (1H,s).

Provenance & Evidence